WEREWOLVES AT HOGWARTS, SEPTEMBER 1991 ONWARD

Wolfsbane Potion:
Taking the Wolfsbane Potion becomes supervised.

Full moon nights: Werewolves have their own room in the North West tower inside the castle. No one else can find or access the tower except a werewolf student and staff member who know about one. Thus it's also completely sound-proof.

All werewolf students are required to go and stay in that room well before the transformation begins. There's entertainment for the night, fitting for human intelligence and workable in a wolf form, but can also include chewing toys and such if someone wants or needs. All entertainment has been kept harmless, it's difficult to harm yourself or another person with them.

You can't get out of that room before someone from the staff comes and opens the portal in the morning, with a spell specifically designed for the purpose. That usually happens around half past six, so that the student has had time to transform back and get dressed.

The staff is required to make sure that everyone who should be, is in that room. If someone isn't they start to look for him/her. A runway student can expect a long detention period and a letter to his/her parents.

All staff members who know about the werewolf student have a spell that opens up an audiovisual portal to the room, so that they can quickly check that everything's alright.